PDF24 PDF Creator installs a virtual printer driver that allows you to convert any printable document or image into PDF format. You can also import documents from your scanner, combine multiple documents into one and delete selected pages from existing PDF files. The program supports creation of secure, digitally signed documents, PDF quality settings, integrated preview, emailing, and more.

You can either drag'n drop documents onto the GUI or convert them from any other program by using the virtual printer driver - simply select the PDF24 printer instead of your regular paper printer.